72131711 has 2 divisors, whose sum is σ = 72131712. Its totient is φ = 72131710.

The previous prime is 72131701. The next prime is 72131713. The reversal of 72131711 is 11713127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72131711 - 2¹⁰ = 72130687 is a prime.

It is a Sophie Germain prime.

Together with 72131713, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72131713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36065855 + 36065856.

It is an arithmetic number, because the mean of its divisors is an integer number (36065856).

Almost surely, 2^72131711 is an apocalyptic number.

72131711 is a deficient number, since it is larger than the sum of its proper divisors (1).

72131711 is an equidigital number, since it uses as much as digits as its factorization.

72131711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294, while the sum is 23.

The square root of 72131711 is about 8493.0389731827. The cubic root of 72131711 is about 416.2702859349.

Adding to 72131711 its reverse (11713127), we get a palindrome (83844838).

The spelling of 72131711 in words is "seventy-two million, one hundred thirty-one thousand, seven hundred eleven".